Laserfiche WebLink
i <br /> E <br /> E <br /> - i <br /> James Tjosvold <br /> i <br /> Wg <br /> February 7, 1990 <br /> described as episodes of three days in which the heaviest day of <br /> each episode is analyzed. The results are shown in Table 1 <br /> (episode 2) and Table 2 (episode 3) . Episode 1 was voided <br /> because of a malfunctioning meteorological station. <br /> Comments <br /> Chromium - Results from Phase I ranged from 3 - 5 ng/m3 for <br /> inhalable particulate and 4 - 107 ng/m for total particulate. <br /> Based on the EPA evaluation of trivalent chromium (prevalent <br /> species on site surface) 3. the level that should not pose a risk <br /> to humans is 16, 000 ng/m . Based on these values, chromium was <br /> excluded from any risk evaluation. <br /> Arsenic (Total) - Total particulate samplers collect airborne <br /> particulates of all sizes. The results are used to calculate the <br /> risk from ingestion of airborne particulate. This risk is minor <br /> compared to inhalation of smaller particulates and was not <br /> included in the risk assessment. <br /> M&B should include the ingestion route via particulates to <br /> provide a complete assessment. <br /> Arsenic (Inhalable) - Particulates in the respiraYle range (2-10 <br /> um) were collected. Concentrations from 3-23 ng/m were detected <br /> from the interior of the facility. EPA Integrated �isk <br /> Information System (IRIS) calculates a concentration 0.2 ng/m to <br /> pose an excess cancer risk of one in million for residents. DHS <br /> calculation for excess cancer risk is 0. 7 ng/m for offsite <br /> workers. Based on the measured results, additional sampling at <br /> the facility boundary and nearest receptor was warranted. <br /> PCP (Particulate) - Total particulate samples were analyzed for <br /> PCP. The chemical was not detected in any samples except once in <br /> episode 2 . <br /> The data indicates that either no PCP contaminated dust was <br /> released or that PCP is stripped off the dust which is trapped on <br /> the filter. <br /> PCP (Vapor) - A foam plug which traps PCP vapor was placed in <br /> series be�ind the PCP particulate filter. Results range from 6.7 <br /> - 80 ug/m . DHS has calculated an applied action level (AAL) for <br /> PCP in air. A level of 0. 22 ug/m in air pose a one in a <br /> million cancer risk for residents and 0. 79 ug/m for offsite <br /> workers. Based on the measured concentrations, additional <br /> sampling at the facility boundary and nearest receptor was <br /> warranted. <br />